Allow parser visitors to leverage the parser's state instead of creating their own stacks

tests/test_misc.py

@@ -351,3 +351,29 @@ def test_warning_directive() -> None:
     data = parse_string(content, cleandoc=True)
 
     assert data == ParsedData()
+
+
+def test_empty_block() -> None:
+    """
+    Ensure the simple visitor doesn't break with an empty block
+    """
+    content = """
+      {
+          class X {};
+      }
+    """
+    data = parse_string(content, cleandoc=True)
+
+    assert data == ParsedData(
+        namespace=NamespaceScope(
+            classes=[
+                ClassScope(
+                    class_decl=ClassDecl(
+                        typename=PQName(
+                            segments=[NameSpecifier(name="X")], classkey="class"
+                        )
+                    )
+                )
+            ]
+        )
+    )